B&G H2000 Pilot *DISCONTINUED* - Manual (Page 94)

h2000 Autopilot User Manual
Part 4 - Installation Information
HB-0842-04
4-16
4.3 ROTARY RUDDER REFERENCE SENSOR (RRF)
4.3.1 Installation of RRF
A number of key points must be considered for optimum
performance of the unit:
(1) Mount the unit on a flat surface next to the tiller arm
or steering quadrant. Construct a small platform if
necessary.
(2) Do not lengthen the drag-link arm as this can
transmit excessive vibration to the sensor.
(3) The sensor operating arm can be rotated through
360º. The mid-point of the RRF wiper travel is when the
arm is opposite the cable entry point. The sensor arm
should be approximately opposite the cable entry point
when the helm is in the mid-ships position.
(4) When the rudder is moved hard-over port or hard-
over starboard, the RRF arm should travel through a
minimum angle of 90º to ensure sufficient voltage swing.
Measure the voltage difference between the blue (0V)
and green (signal) wires from the RRF; there should be at
least a 1V dc change from port to starboard.
(5) After fitting and connection of the RRF test the full
movement of the steering gear to ensure no fouling
occurs between the ram drive, steering gear and RRF.
(6) Check for backlash in the linkages. Excessive
backlash will cause errors in the operation of the
autopilot.
The example opposite shows a plan view of a typical system with a
tiller arm and quadrant. When viewed in elevation, the ram drive
arm and rudder reference unit drag-link must not be more than ±9º
from horizontal. Ideally, everything should be horizontally aligned
as this prevents excessive stress during operation.